An article in the January ACE Fitness Journal showed that eating 21 grams of fiber a day may reduce depression. This study followed nearly 17,000 Americans and found that increasing your fiber intake by consuming more fiber rich grains, vegetables, fruit and beans may make you happier. The typical American eats about 15-18 g a day, but fiber can provide your body with essential vitamins, minerals and antioxidants that improve brain function and can improve our gut. So, eating fiber makes your whole body happier - mind, body, and gut.